Improvement in the manufacture of paper-pulp from wood



i NITED STATESv PATENT OFFICE.

GEORGE VINING, OF PITTSFIELD, MASSACHUSETTS.

IMPROVEMENT IN THE MANUFACTURE OF PAPER-PULP FROM WOOD.

Specification forming part of Letters Patent No. 98,210., dated December 21, 1869.

To all whom t may concern Be it known that I, GEORGE V1NING,of Pittsfield, in the county of Berkshire and State of Massachusetts, have invented anew and valuable Improvement in the Manufacture of Paper-Pulp from Wood-Fiber; and l do hereby declare that the following is a full, clear, and exact description of the construe tion and operation of the same, reference being had to the annexed drawings, making a part of this specitication, and to the letters and gures of reference marked thereon.

Figure 1 of the drawings is a central vertical longitudinal section of my invention.

My invention relates to means for grinding wood-fiber into paper-pulp; and consists, mainly, in the construction of a Wheel or cylinder covered with emery, whereby Wood, Whether wet or dry, green or seasoned, may be ground into pulp suitable for the manufacture of the finest paper., and Without loss of stock.

Various methods have been adopted for reducing the fiber of wood into paper-pulp or stock. The objection to thei ordinary grindstone is that, in order to secure efficiency, the woozi must be green, or soaked so as to resemble green wood. This arises from the nature of the grindstone, which will operate properly only when it is softened by water. Hence the consequent wearing away of the stone renders it necessary to wash the pulp, in which operation much loss of stock is entailed, in consequence of its passage with the water through the wire-cloth of the washing-machine. ln the use of iron rings or cylinders, finished like the surface of a rasp or file, the condition of the wood is necessarily different. It becomes requisite that the wood shall be kiln-dried, which process affects the sap in such a manner lthat the stock cannot be properly bleached. Further, the depressions in the rasp-like surface fill up, and then Will not work well. Such a wheel or cylinder is also liable to rust, and thereby affect the pulp, so

that it cannot be used for the manufacture of fine or white paper.

A Wheel which Would act equally Well on Wet 0r dry Wood, and Would not be liable to the objections mentioned above, has long been desired.

The letter A of the drawings designates a Wheel or cylinder whose grinding'surface is formed of a layer of emery, c, properly fixed. B indicates the frame of the apparatus; O, a piece of wood in process of heilig ground; and D, the pulp-trough.

Sometimes, instead of covering a Wheel with emery, it is more convenient to use a wheel or cylinder of vulcanite mixed with emery-powder; or an endless band covered with a preparation of' emery may be employed.

The use of emery is not liable to the objections mentioned above. It will operate equally Well with Wet or dry wood; does not readily disintegrate; its interstices do not fill up audit does not rust. It is not only useful in grinding of Wood-ber. There are many other materials which require to be ground in converting them into stock for paper-manufacture.

What I claim as my invention, and desire to secure by Letters Patent, isn l. In, combination with a machine for the manufacture of paper or paperpulp from woodtber and other materials, the emery wheel or cylinder A, as specified.

2. The emery wheel or cylinder herein dcscribed, when used in the manufactureof paper or paper-pulp from Wood-fiber and other materials, constructed and arranged to operate as specified.

ln testimony that I. claim the above I have hereunto subscribed my name in the presence of two witnesses.

GEO. VIN ING. 

